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sampleGrabber Class Reference

Inheritance diagram for sampleGrabber:

[legend]Collaboration diagram for sampleGrabber:

[legend]List of all members.

Public Member Functions
void	grab (RImage< float > &pixels, const double *index_flags)
	sampleGrabber (const mxArray **ci, const int &max_num_patches_, mxArray *&patch_array)
	~sampleGrabber ()

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Constructor & Destructor Documentation

sampleGrabber (  const mxArray **  ci, const int &  max_num_patches_, mxArray *&  patch_array )  [inline]

Definition at line 27 of file mp_grabSamples.cc. 00027 : 00028 MPISearchMex(ci,max_num_patches_,patch_array) {}; ~sampleGrabber() {}

~sampleGrabber (   )  [inline]

Definition at line 29 of file mp_grabSamples.cc. {}

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Member Function Documentation

void grab (  RImage< float > &  pixels, const double *  index_flags )

Definition at line 79 of file mp_grabSamples.cc. References MPISearchStream::allocated, MPIImagePyramid::begin(), c, corner, MPISearchStream::corners, MPIImagePyramid::end(), MPISearchStream::fns, RImage::height, index_flags, MPISearchStream::init(), MPISearchObjectDetector< float >::integrateImages(), MPISearchStream::mpi, MPISearchStream::norm_window, MPISearchStream::nw_c, MPISearchStream::nw_fn, p, FeatureData::patchsize, r, sprintf(), FeatureData::stdAdjusts, Corner::value, RImage::width, and y. { if(!stream.allocated){ //cout << "MPISearchObjectDetector::search: stream not allocated. Allocating data" << endl; stream.init(pixels.width, pixels.height, data, 1); } integrateImages(pixels, stream); double * p = patches; int numWindows = 0; int scale_index; float scale_factor; int ind, x, y; char errStr[256]; MPIImagePyramid<float>::const_iterator scale = stream.mpi->begin(); MPIImagePyramid<float>::const_iterator last_scale = stream.mpi->end(); for( ; scale != last_scale; ++scale){ // get pointers to cached values for this scale scale_index = scale.getScale(scale_factor); //cout << "Scale: " << scale_index << ", scale_factor = " << scale_factor << endl; float sf2 = scale_factor * scale_factor; CornerCache<float> **corners = stream.corners[scale_index]; float *fns = stream.fns[scale_index]; CornerCache<float> *nw_c = stream.nw_c[scale_index]; float nw_fn = stream.nw_fn[scale_index]; MPIScaledImage<float>::const_iterator window = (*scale).begin(), last_window = (*scale).end(); //cout << "Index = " << ind << ", x = " << x << ", y = " << y << endl; for( ; window != last_window; ++window, ++numWindows){ if(index_flags[numWindows] > 0){ // cout << "Grabbing a Patch at index " << numWindows << endl; // calculate the statistics for this sub window window.getIndex(ind); window.getCoords(x,y); //cout << "Index = " << ind << ", x = " << x << ", y = " << y << endl; double mean = 0.0; double mean2 = 0.0; for(int corner = 0; corner < 4; corner++) { mean += window.getPixel0 (nw_c[corner].scaledIndex) * stream.norm_window[corner].value; mean2 += window.getPixel1 (nw_c[corner].scaledIndex) * stream.norm_window[corner].value; } mean /= nw_fn; mean2 /= nw_fn; double standard_deviation = sqrt(mean2 - mean*mean); if(standard_deviation < 0.00001){ sprintf(errStr,"mp_grabSamples: std = 0 at index %d",ind); mexErrMsgTxt(errStr); } double top_left = static_cast<double>(window.getScalePixel(0,0,0)); double top_row; double left_column; double divisor = 1.0/(sf2 * standard_deviation * data.stdAdjusts[static_cast<int>(scale_factor+0.5f)-1]); double * oldp = p; for(int c = 0; c < data.patchsize; ++c){ top_row = static_cast<double>(window.getScalePixel(0,c,0)); for(int r = 0; r < data.patchsize; ++r){ left_column = static_cast<double>(window.getScalePixel(0,0,r)); *(p++) = (static_cast<double>(window.getScalePixel(0,c,r)) - left_column - top_row + top_left - (r)*(c)*sf2*mean) * divisor; } } } } } }

Here is the call graph for this function:

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The documentation for this class was generated from the following file:

• mp_grabSamples.cc

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